/*!	 blinepoint.cpp
**	 Template File
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include "blinepoint.h"

#endif

using namespace std;
using namespace synfig;

void
synfig::BLinePoint::reverse()
{
    if (split_tangent_both_) {
        std::swap(tangent_[0], tangent_[1]);
        tangent_[0] = -tangent_[0];
        tangent_[1] = -tangent_[1];
    } else if (merge_tangent_both_) {
        tangent_[0] = -tangent_[0];
        tangent_[1] = -tangent_[1];
    } else if (split_tangent_radius_) {
        Real mag0 = tangent_[0].mag(), mag1 = tangent_[1].mag();
        tangent_[0] = Vector(-mag1, mag0 == 0 ? Angle::rad(0) : tangent_[0].angle());
        tangent_[1] = Vector(-mag0, mag1 == 0 ? Angle::rad(0) : tangent_[1].angle());
        update_tangent2();
    } else {
        Real mag0 = tangent_[0].mag(), mag1 = tangent_[1].mag();
        Angle angle0 = mag0 == 0 ? Angle::rad(0) : tangent_[0].angle();
        tangent_[0] = Vector(-mag0, mag1 == 0 ? Angle::rad(0) : tangent_[1].angle());
        tangent_[1] = Vector(-mag1, angle0);
        update_tangent2();
    }
}

void
synfig::BLinePoint::update_tangent2()
{
    if (tangent_[0].mag_squared() != 0) {
        tangent2_radius_split_ = Vector(tangent_[1].mag(), tangent_[0].angle());
    } else {
        tangent2_radius_split_ = tangent_[1];
    }

    tangent2_angle_split_ = Vector(tangent_[0].mag(), tangent_[1].angle());
    return;
}

void
synfig::BLinePoint::update_flags()
{
    split_tangent_both_ = split_tangent_radius_ && split_tangent_angle_;
    merge_tangent_both_ = !split_tangent_radius_ && !split_tangent_angle_;
}